To use your z/OS® system to establish a CA within the IdenTrust infrastructure, the following requirements apply:

1. You must operate PKI Services with z/OS Version 1 Release 5, or higher.
2. Your PKI Services installation must be completed, with PKI Services established as a certificate authority (CA) and configured as a self-signed CA. (See Configuring z/OS PKI Services as a CA.)
3. You must supply your own (or OEM) online certificate status protocol (OCSP) responder.